CN101481769A - High nickel austenite ductile iron valve stem nut and manufacturing method thereof - Google Patents
High nickel austenite ductile iron valve stem nut and manufacturing method thereof Download PDFInfo
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- CN101481769A CN101481769A CNA2008100194389A CN200810019438A CN101481769A CN 101481769 A CN101481769 A CN 101481769A CN A2008100194389 A CNA2008100194389 A CN A2008100194389A CN 200810019438 A CN200810019438 A CN 200810019438A CN 101481769 A CN101481769 A CN 101481769A
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a valve stem nut which is manufactured by using D-2 type high nickel austenitic nodular cast iron and a manufacturing method thereof. The adopted material compositions are as follows: no more than 3.0 percent of carbon, 1.5 to 3.0 percent of silicon, 0.7 to 1.25 percent of manganese, 1.75 to 2.75 percent of chromium, 18 percent to 22 percent of nickel and no more than 0.08 percent of phosphorus; the mechanical properties are as follows: the tensile strength is larger than or equal to 400MPa, the yield strength is larger than or equal to 207MPa, the elongation is larger than or equal to 8 percent and the hardness is 139 to 202HB; the structure is as follows: spheroidal graphite is distributed on the austenitic matrix which contains little amount of carbide; after the materials are selected, the manufacturing method comprises the following nine steps: 1. molding and core making; 2. smelting; 3. spheroidisation; 4. inoculation; 5. inspection before soldering; 6. casting; 7. inspection after soldering; 8. cleaning and rough machining; 9. fine cutting and processing of machine tool, and the like. The invention has the advantages that the selected valve stem nut material has good corrosion resistance, high temperature resistance and oxidation resistance, simultaneously has good low heat expansibility and low temperature impact toughness, and completely meets various bad working environment of the valve stem nut.
Description
Affiliated technical field
The invention belongs to valve and make the field, relate in particular to a kind of D of use-2 type high-nickel austenite nodular cast iron as material valve stem nut and manufacture method thereof.
Background technology
Valve stem nut is to be used for valve opening and to cut out, combine the crux valve parts that carries out work with parts such as valve plate, valve rods, how to select for use suitable material to make valve stem nut, making it have heatproof, withstand voltage, corrosion resistant superperformance in atrocious weather and Working environment, is the crux of making valve stem nut.
The material of existing manufacturing valve stem nut mainly is common steel, cast iron or aluminium bronze, the former is because in the defective of aspect such as against corrosion, anti-oxidant, heat-resisting, make valve stem nut easily with the valve rod rust extremely, directly influence the work-ing life of valve, latter's xantal, its major ingredient 90-95% is that copper, 5-10% is aluminium, though have certain corrosion resistance nature, intensity is relatively poor, and manufacturing cost is bigger, therefore selecting a kind of novel equivalent material for use, is the crux of making valve stem nut.
Summary of the invention
The invention provides valve stem nut and manufacture method thereof that a kind of brand-new material is made.
Concrete technical scheme: a kind of select for use valve stem nut that D-2 type high-nickel austenite nodular cast iron makes with and manufacture method, selected material composition is carbon≤3.0%, silicon 1.5-3.0%, manganese 0.7-1.25%, chromium 1.75-2.75, nickel 18-22%, phosphorus≤0.08%.Mechanical property is tensile strength 〉=400MPa, yield strength 〉=207Mpa, unit elongation 〉=8%, hardness 139-202HB, it is organized as distribution globular graphite on the austenitic matrix, and contain minor amount of carbide, behind the selected material, making method is divided into: 1, molding and core making, 2, melting, 3, spheroidizing, 4, inoculation, 5, the stokehold is detected, and 6, cast, 7, detect behind the stove, 8, cleaning and roughing, 9, totally 9 steps such as the meticulous machining of lathe etc., and usefulness of the present invention is that selected valve rod sieve parent material has good solidity to corrosion, high temperature resistant, oxidation-resistance, good low heat expansion property and low-temperature impact toughness are arranged simultaneously, meet the various abominable Working environment of valve stem nut fully.
Description of drawings
Accompanying drawing 1 is that valve stem nut combines figure with valve
Valve body in the drawings 1; 2, valve plate; 3, valve rod; 4, valve gap; 5, valve stem nut
Accompanying drawing 2 is the valve stem nut side-view
Accompanying drawing 3 is the valve stem nut side-view
Embodiment:
To further specify the specific embodiment of the present invention below:
By composition and the mechanical property and the matrix composition requirement of selected material in the above-mentioned summary of the invention, selected material, making D-2 type high-nickel austenite nodular cast iron by nine following steps is the valve stem nut of material.
1, molding and core making
The mixed system of roughing sand clay-bonded sand with the casting of 20-70 purposes is used to make external form, is coated with behind the graphite paint, and the drying room about 400 ℃ is dried, and core adopts tung oil sand to make oven dry.
2, melting
With the magnesium iron pig iron is major ingredient, wherein: carbon 〉=4.0%, silicon≤1.0, manganese≤0.3, phosphorus≤0.05, sulphur≤0.03.
Alloy material adopts sheet nickel, contains the mid-carbon fe-mn of manganese 80%, contains the high carbon ferro-chrome of chromium more than 60%, and content shown in the according to the form below adds melting
| Composition | Content (%) |
| Carbon | ≤3.0 |
| Silicon | 1.5—3.0 |
| Manganese | 0.7—1.25 |
| Sulphur | |
| Phosphorus | ≤0.08 |
| Nickel | 18—22 |
| Press against | 1.75—2.75 |
Smelting temperature to 1480-1500 ℃, the humidity of coming out of the stove 〉=1470 ℃.
3, spheroidizing
Nodulizing agent is selected RE-Mg-ferrosilicon alloy for use, and add-on is 1.2-2.0%, adopts pit to pour method.
4, inoculation
Select the nucleating agent that contains strontium for use, add-on is 0.8-1.2%, makes late inoculation respectively and handle in the nodularization process and after the nodularization.
5, the stokehold is detected
1. adopt thermal analyzer to detect carbon, silicone content and the carbon equivalent of solution, and tentatively judge its nodularization rate.
2. adopt the chill block assay method to judge its nodularization effect.
3. get metallographic specimen and make, and determine its nodularization rate in order to carrying out metallographic behind the stove.
6, cast
After nodularization, inoculation finish, to skim at once, teeming temperature is controlled at 1400-1440 ℃, and pours into a mould in 10 minutes and finish.
7, detect behind the stove
Carry out chemical analysis behind the stove and detect, guarantee that various alloying elements are all within the scope of defined.
To the metallographic specimen polishing, under metaloscope, observe, judge that its nodularization rate should guarantee more than II level nodularization rate.
8, cleaning and roughing
The high-nickel austenite nodular cast iron valve-stem nut foundry goods of casting successful is roughly selected, found that in time outward appearance casting flaws such as knockout, slag inclusion, core shift, shrinkage cavity are to guarantee that product is qualified.
9, the meticulous machining of lathe
According to the specification needs of joining valve, carry out machine cut processing.Finish the manufacturing of D-2 type high-nickel austenitic cast iron valve stem nut.
Have good nodularization rate by 9 above-mentioned step process method output materials, meet the valve stem nut of service requirements.
Claims (1)
- A kind of select for use valve stem nut that D-2 type high-nickel austenite nodular cast iron makes with and manufacture method, selected material composition is carbon≤3.0%, silicon 1.5-3.0%, manganese 0.7-1.2%, chromium 1.75-2.75, nickel 18-22%, phosphorus≤0.08%.Mechanical property is tensile strength 〉=400MPa, yield strength 〉=207Mpa, and unit elongation 〉=8%, hardness 139-202HB is organized as distribution globular graphite on the pressure body matrix difficult to understand, and contains minor amount of carbide, and behind the selected material, making method is divided into: 1, molding and core making; 2, melting; 3, spheroidizing; 4, inoculation; 5, the stokehold is detected; 6, cast; 7, detect behind the stove; 8, cleaning and roughing; 9, totally 9 steps such as meticulous machining of lathe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100194389A CN101481769A (en) | 2008-01-07 | 2008-01-07 | High nickel austenite ductile iron valve stem nut and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100194389A CN101481769A (en) | 2008-01-07 | 2008-01-07 | High nickel austenite ductile iron valve stem nut and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN101481769A true CN101481769A (en) | 2009-07-15 |
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| CNA2008100194389A Pending CN101481769A (en) | 2008-01-07 | 2008-01-07 | High nickel austenite ductile iron valve stem nut and manufacturing method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814488A (en) * | 2012-09-17 | 2012-12-12 | 辽宁远宇重工机械有限公司 | Casting method for high-nickel ductile iron pressure-bearing component of -41 to -75 DEG C low-temperature gas compression machine |
| CN102836968A (en) * | 2012-09-17 | 2012-12-26 | 辽宁远宇重工机械有限公司 | Forging method of high nickel ductile iron pressure-containing member for low temperature gas compression machinery used at temperature of minus 76 DEG C to minus 121 DEG C |
| CN103556043A (en) * | 2013-11-04 | 2014-02-05 | 沈阳工业大学 | High-toughness and high-hardness ductile cast iron material used at ultralow temperature and preparation method thereof |
| CN105950959A (en) * | 2016-07-18 | 2016-09-21 | 安徽德宝压缩机有限公司 | High-nickel austenite nodular cast iron and production technique for same |
| CN106756466A (en) * | 2016-12-28 | 2017-05-31 | 重庆力劲机械有限公司 | A kind of big thick stick nut cast iron quality formula |
| CN114381650A (en) * | 2022-01-17 | 2022-04-22 | 金华市强宏板式家具机械有限公司 | Stainless steel threaded nail and preparation method thereof |
| CN115786802A (en) * | 2022-11-28 | 2023-03-14 | 安徽工业大学 | Exhaust manifold, high-nickel nodular cast iron and die casting method thereof |
-
2008
- 2008-01-07 CN CNA2008100194389A patent/CN101481769A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814488A (en) * | 2012-09-17 | 2012-12-12 | 辽宁远宇重工机械有限公司 | Casting method for high-nickel ductile iron pressure-bearing component of -41 to -75 DEG C low-temperature gas compression machine |
| CN102836968A (en) * | 2012-09-17 | 2012-12-26 | 辽宁远宇重工机械有限公司 | Forging method of high nickel ductile iron pressure-containing member for low temperature gas compression machinery used at temperature of minus 76 DEG C to minus 121 DEG C |
| CN103556043A (en) * | 2013-11-04 | 2014-02-05 | 沈阳工业大学 | High-toughness and high-hardness ductile cast iron material used at ultralow temperature and preparation method thereof |
| CN105950959A (en) * | 2016-07-18 | 2016-09-21 | 安徽德宝压缩机有限公司 | High-nickel austenite nodular cast iron and production technique for same |
| CN106756466A (en) * | 2016-12-28 | 2017-05-31 | 重庆力劲机械有限公司 | A kind of big thick stick nut cast iron quality formula |
| CN114381650A (en) * | 2022-01-17 | 2022-04-22 | 金华市强宏板式家具机械有限公司 | Stainless steel threaded nail and preparation method thereof |
| CN115786802A (en) * | 2022-11-28 | 2023-03-14 | 安徽工业大学 | Exhaust manifold, high-nickel nodular cast iron and die casting method thereof |
| CN115786802B (en) * | 2022-11-28 | 2023-12-12 | 安徽工业大学 | Exhaust manifold, high-nickel spheroidal graphite cast iron and die casting method thereof |
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Open date: 20090715 |